/Engine/Source/Runtime/CoreUObject/Public/UObject/PackageTrailer.h
Returns an array of the payloads that match the given filter type.  EPayloadFilter
[TArray](API\Runtime\Core\Containers\TArray)< [FIoHash](API\Runtime\Core\IO\FIoHash) > GetPayloads ( [EPayloadFilter](API\Runtime\CoreUObject\UObject\UE__EPayloadFilter) Filter ) const